Cannot use oracle 10g ProC compiler

Every time I run the ProC compiler of Oracle 10g I get the following error:
PCC-F-NOERRFILE, unable to open error message file, facility PR2
What does thidoPost=true

You have your ORACLE_HOME environment variable incorrectly defined.
C:\>set ORACLE_HOME=invalid
C:\>proc
PCC-F-NOERRFILE, unable to open error message file, facility PR2
C:\>

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